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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-84639

Uninitialized memory in MIME parsing

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
mozilla

Description

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Thunderbird

  • 140.15 to ≤ 140.*unaffected
  • 153.2 to ≤ 153.*unaffected
  • 155 to ≤ *unaffected

References